<template>
  <div class="component-upload-image">
    <el-upload
        multiple
        :action="uploadImgUrl"
        list-type="picture-card"
        :on-success="handleUploadSuccess"
        :before-upload="handleBeforeUpload"
        :limit="limit"
        :on-error="handleUploadError"
        :on-exceed="handleExceed"
        ref="imageUpload"
        :before-remove="handleDelete"
        :show-file-list="true"
        :headers="headers"
        :file-list="fileList"
        :on-preview="handlePictureCardPreview"
        :class="{ hide: fileList.length >= limit }"
    >
      <el-icon class="avatar-uploader-icon">
        <plus/>
      </el-icon>
    </el-upload>

    <!-- 上传提示 -->
    <div class="el-upload__tip" v-if="showTip">
      请上传
      <template v-if="fileSize">
        大小不超过 <b style="color: #f56c6c">{{ fileSize }}MB</b>
      </template>
      <template v-if="fileType">
        格式为 <b style="color: #f56c6c">{{ fileType.join("/") }}</b>
      </template>
      的文件
    </div>

    <el-dialog
        v-model="dialogVisible"
        title="预览"
        width="800px"
        append-to-body
    >
      <img
          :src="dialogImageUrl"
          style="display: block; max-width: 100%; margin: 0 auto"
      />
    </el-dialog>

  </div>

</template>

<script setup>

const props = defineProps({
  modelValue: [String, Object, Array],
  // 图片数量限制
  limit: {
    type: Number,
    default: 1,
  },
  // 大小限制(MB)
  fileSize: {
    type: Number,
    default: 5,
  },
  // 文件类型, 例如['png', 'jpg', 'jpeg']
  fileType: {
    type: Array,
    default: () => ["png", "jpg", "jpeg", "gif", "webp"],
  },
  // 是否显示提示
  isShowTip: {
    type: Boolean,
    default: true
  },
  type: {
    type: Boolean,
    default: false
  }
});

const {proxy} = getCurrentInstance();
const emit = defineEmits();
const number = ref(0);
const uploadList = ref([]);
const dialogImageUrl = ref("");
const dialogVisible = ref(false);
const baseUrl = import.meta.env.VITE_APP_BASE_API;
const uploadImgUrl = ref(import.meta.env.VITE_APP_BASE_API + "/admin/common/upload"); // 上传的图片服务器地址
if (baseUrl == null || baseUrl === '/') {
  uploadImgUrl.value = "/admin/common/upload";
}
const headers = ref({
  Authorization: "Bearer " + localStorage.getItem('token'),
});
const fileList = ref([]);
const showTip = computed(
    () => props.isShowTip && (props.fileType || props.fileSize)
);

const value_type = ref(props.type);

watch(() => props.modelValue, val => {
  if (val) {
    // 首先将值转为数组
    if (Array.isArray(val)) {
      value_type.value = true;
    } else {
      value_type.value = false;
    }
    const list = Array.isArray(val) ? val : props.modelValue.split(",");
    // 然后将数组转为对象数组
    fileList.value = list.map(item => {
      if (typeof item === "string") {
        if (item.indexOf(baseUrl) === -1) {
          // item = {name: baseUrl + item, url: baseUrl + item};
          item = {name: item, url: item};
        } else {
          item = {name: item, url: item};
        }
      } else {
        if (!item.url.startsWith("https://") && !item.url.startsWith("http://")) {
          if (!item.url.startsWith(import.meta.env.VITE_APP_BASE_API)) {
            item = {name: item.url, url: import.meta.env.VITE_APP_BASE_API + item.url}
          }
        }
      }
      return item;
    });
  } else {
    fileList.value = [];
    return [];
  }
}, {deep: true, immediate: true});


// 上传前loading加载
function handleBeforeUpload(file) {
  let isImg = false;
  if (props.fileType.length) {
    let fileExtension = "";
    if (file.name.lastIndexOf(".") > -1) {
      fileExtension = file.name.slice(file.name.lastIndexOf(".") + 1);
    }
    isImg = props.fileType.some(type => {
      if (file.type.indexOf(type) > -1) return true;
      if (fileExtension && fileExtension.indexOf(type) > -1) return true;
      return false;
    });
  } else {
    isImg = file.type.indexOf("image") > -1;
  }
  if (!isImg) {
    proxy.$modal.msgError(
        `文件格式不正确, 请上传${props.fileType.join("/")}图片格式文件!`
    );
    return false;
  }
  if (props.fileSize) {
    const isLt = file.size / 1024 / 1024 < props.fileSize;
    if (!isLt) {
      proxy.$modal.msgError(`上传头像图片大小不能超过 ${props.fileSize} MB!`);
      return false;
    }
  }
  proxy.$modal.loading("正在上传图片，请稍候...");
  number.value++;
}

// 文件个数超出
function handleExceed() {
  proxy.$modal.msgError(`上传文件数量不能超过 ${props.limit} 个!`);
}

// 上传成功回调
function handleUploadSuccess(res, file) {
  if (res.code === 0) {
    let url = res.data.url;
    if (!url.startsWith("https://") && !url.startsWith("http://")) {
      if (!url.startsWith(import.meta.env.VITE_APP_BASE_API)) {
        url = import.meta.env.VITE_APP_BASE_API + url;
      }
    }
    uploadList.value.push({name: res.data.fileName, url: url});
    uploadedSuccessfully();
  } else {
    number.value--;
    proxy.$modal.closeLoading();
    proxy.$modal.msgError(res.msg);
    proxy.$refs.imageUpload.handleRemove(file);
    uploadedSuccessfully();
  }
}

// 删除图片
function handleDelete(file) {
  const findex = fileList.value.map(f => f.name).indexOf(file.name);
  if (findex > -1 && uploadList.value.length === number.value) {
    fileList.value.splice(findex, 1);
    if (!value_type.value) {
      emit("update:modelValue", listToString(fileList.value));
    } else {
      emit("update:modelValue", fileList.value);
    }
    return false;
  }
}

// 上传结束处理
function uploadedSuccessfully() {
  if (number.value > 0 && uploadList.value.length === number.value) {
    fileList.value = fileList.value.filter(f => f.url !== undefined).concat(uploadList.value);
    uploadList.value = [];
    number.value = 0;
    if (!value_type.value) {
      emit("update:modelValue", listToString(fileList.value));
    } else {
      emit("update:modelValue", fileList.value);
    }
    proxy.$modal.closeLoading();
  }
}

// 上传失败
function handleUploadError() {
  proxy.$modal.msgError("上传图片失败");
  proxy.$modal.closeLoading();
}

// 预览
function handlePictureCardPreview(file) {
  dialogImageUrl.value = file.url;
  dialogVisible.value = true;
}

// 对象转成指定字符串分隔
function listToString(list, separator) {
  let strs = "";
  separator = separator || ",";
  for (let i in list) {
    if (undefined !== list[i].url && list[i].url.indexOf("blob:") !== 0) {
      // strs += list[i].url.replace(baseUrl, "") + separator;
      strs += list[i].url + separator;
    }
  }
  return strs != "" ? strs.substr(0, strs.length - 1) : "";
}


</script>

<style scoped lang="scss">
// .el-upload--picture-card 控制加号部分
:deep(.hide .el-upload--picture-card) {
  display: none;
}
</style>